The Move Deleter is an NPC in Blackthorn City that can help your Pokémon forget any moves. You’ll find his house just left of the Pokémon Center and PokéMart in Blackthorn.
To forget a move, simply talk to the Move Deleter and choose the move you want to forget from the pop-up menu. He’ll remove it free of charge.
Visiting the Move Deleter is the only way to remove HM moves like Cut and Whirlpool from your Pokémon’s four-move memory.
You can also use his service to remove Gen 2 moves from any Pokémon you plan to send to Pokémon Red, Blue, or Yellow through the Time Capsule.
Finding the Move Deleter
You’ll find the Move Deleter’s House a few steps to the left of the Pokémon Center and PokéMart in Blackthorn City.
You’ll find the Move Deleter inside at any time. And you can work with him to delete as many moves as you want — all at no cost.